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Tension or Temperature. Dogs may shake as a way of relieving tension. If a dog is feeling nervous or uncomfortable in a situation, it might shake the whole body as a way of shaking out tension. This behavior also may function as a means of getting attention from other dogs or people.
Tremors in the Head. The shaking of the head back and forth is a huge sign that your dog is most likely suffering from a neurotic disorder. This disorder can be caused by numerous things, but they all should be taken very seriously. Your dog could have inherited the disorder from its parents.